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import $ from 'jquery';
const isSupportAmd = typeof define === 'function' && define.amd; // eslint-disable-line
/**
* returns whether font is installed or not.
*
* @param {String} fontName
* @return {Boolean}
*/
const genericFontFamilies = ['sans-serif', 'serif', 'monospace', 'cursive', 'fantasy'];
function validFontName(fontName) {
return ($.inArray(fontName.toLowerCase(), genericFontFamilies) === -1) ? `'${fontName}'` : fontName;
}
function isFontInstalled(fontName) {
const testFontName = fontName === 'Comic Sans MS' ? 'Courier New' : 'Comic Sans MS';
const testText = 'mmmmmmmmmmwwwww';
const testSize = '200px';
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
context.font = testSize + " '" + testFontName + "'";
const originalWidth = context.measureText(testText).width;
context.font = testSize + ' ' + validFontName(fontName) + ', "' + testFontName + '"';
const width = context.measureText(testText).width;
return originalWidth !== width;
}
const userAgent = navigator.userAgent;
const isMSIE = /MSIE|Trident/i.test(userAgent);
let browserVersion;
if (isMSIE) {
let matches = /MSIE (\d+[.]\d+)/.exec(userAgent);
if (matches) {
browserVersion = parseFloat(matches[1]);
}
matches = /Trident\/.*rv:([0-9]{1,}[.0-9]{0,})/.exec(userAgent);
if (matches) {
browserVersion = parseFloat(matches[1]);
}
}
const isEdge = /Edge\/\d+/.test(userAgent);
let hasCodeMirror = !!window.CodeMirror;
const isSupportTouch =
(('ontouchstart' in window) ||
(navigator.MaxTouchPoints > 0) ||
(navigator.msMaxTouchPoints > 0));
// [workaround] IE doesn't have input events for contentEditable
// - see: https://goo.gl/4bfIvA
const inputEventName = (isMSIE) ? 'DOMCharacterDataModified DOMSubtreeModified DOMNodeInserted' : 'input';
/**
* @class core.env
*
* Object which check platform and agent
*
* @singleton
* @alternateClassName env
*/
export default {
isMac: navigator.appVersion.indexOf('Mac') > -1,
isMSIE,
isEdge,
isFF: !isEdge && /firefox/i.test(userAgent),
isPhantom: /PhantomJS/i.test(userAgent),
isWebkit: !isEdge && /webkit/i.test(userAgent),
isChrome: !isEdge && /chrome/i.test(userAgent),
isSafari: !isEdge && /safari/i.test(userAgent) && (!/chrome/i.test(userAgent)),
browserVersion,
jqueryVersion: parseFloat($.fn.jquery),
isSupportAmd,
isSupportTouch,
hasCodeMirror,
isFontInstalled,
isW3CRangeSupport: !!document.createRange,
inputEventName,
genericFontFamilies,
validFontName,
};
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